AMARIN CORP PLC\UK — Director's Dealing 2021

Jan 29, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMARIN CORP PLC\UK (AMRN)
CIK: 0000897448
Period of Report: 2021-01-29

Reporting Person: THERO JOHN F (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-01-29	Ordinary Shares	M	123666.00	—	Acquired	2879006.00	Direct
2021-01-29	Ordinary Shares	M	72033.00	—	Acquired	2951039.00	Direct
2021-01-29	Ordinary Shares	F	77460.00	$7.50	Disposed	2873579.00	Direct
2021-01-29	Ordinary Shares	M	6736.00	—	Acquired	2880315.00	Direct
2021-01-29	Ordinary Shares	M	6736.00	—	Acquired	2887051.00	Direct
2021-01-29	Ordinary Shares	F	5302.00	$7.50	Disposed	2881749.00	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-01-29	Restricted Stock Units	$0.00	M	123666.00	Disposed		Ordinary Shares (123666.00)	Direct
2021-01-29	Restricted Stock Units	$0.00	M	72033.00	Disposed		Ordinary Shares (72033.00)	Direct
2021-01-29	Restricted Stock Units	$0.00	M	6736.00	Disposed		Ordinary Shares (6736.00)	Direct
2021-01-29	Restricted Stock Units	$0.00	M	6736.00	Disposed		Ordinary Shares (6736.00)	Direct

Footnotes

F1: The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share.

F2: On February 1, 2018, the Reporting Person was granted 371,000 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). These RSUs vest in three equal installments on each of January 31, 2019, January 31, 2020, and January 31, 2021. The third and final vesting event occurred on January 29, 2021.

F3: Not applicable.

F4: On February 1, 2019, the Reporting Person was granted 216,100 RSUs under the Plan. These RSUs vest in three equal installments on each of January 31, 2020, January 31, 2021, and January 31, 2022. The second vesting event occurred on January 29, 2021.

F5: Represents withholding by the Issuer of shares in respect of tax liability incident to the vesting of a security issued in accordance with Rule 16b-3, and not a market sale of securities.

F6: As previously reported on February 27, 2020, on May 15, 2017, the Reporting Person was granted 970,000 RSUs under the Plan, of which the performance criteria related to two tranches representing 50% of the total award was deemed achieved on February 25, 2020 pursuant to reporting of audited net product revenues for 2019 exceeding $400 million. The tranches vest ratably over 36 months beginning September 30, 2018 subject to achievement of the performance criteria and continued employment of the Reporting Person as provided in the RSU Award Agreement between the Issuer and Reporting Person. The twenty-ninth vesting event occurred on January 29, 2021. The performance criteria related to the remaining 50% tranche has not yet been formally deemed achieved; such tranche has not lapsed as a result of achieving the other two tranches.

F7: Please see the section titled "Remarks" below for additional information.

F8: Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.